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Order by distortion and string modes in pyrochlore antiferromagnets.

Oleg Tchernyshyov1, R Moessner, S L Sondhi

  • 1School of Natural Sciences, Institute for Advanced Study, Princeton, New Jersey 08540, USA.

Physical Review Letters
|February 28, 2002
PubMed
Summary

Magnetoelastic couplings in pyrochlore antiferromagnets induce bond order through a spin-Peierls transition. This leads to diverse low-temperature magnetic phases, characterized by unique magnon modes.

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Area of Science:

  • Condensed matter physics
  • Quantum magnetism
  • Materials science

Background:

  • Pyrochlore antiferromagnets exhibit complex magnetic behavior due to geometric frustration.
  • Understanding the interplay between spin, lattice, and magnetic order is crucial for novel material properties.

Purpose of the Study:

  • To investigate the impact of magnetoelastic couplings on pyrochlore antiferromagnets.
  • To elucidate the mechanisms driving magnetic phase transitions and emergent phenomena.

Main Methods:

  • Utilizing Landau theory, extending previous work by Yamashita and Ueda.
  • Employing classical analyses to model spin-lattice interactions.
  • Analyzing the resulting spin patterns and excitation spectra.

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Main Results:

  • Magnetoelastic couplings drive bond order via a spin-Peierls transition.
  • Transitions occur into various low-temperature Néel phases (collinear, coplanar, mixed).
  • A dispersionless, stringlike magnon mode is identified in the collinear Néel phase.

Conclusions:

  • Magnetoelastic effects are key to understanding magnetic order in pyrochlores.
  • The predicted magnon mode offers a distinct experimental signature of geometric frustration.
  • Findings provide insights into the complex phase diagrams of frustrated magnets.